Dental Lab Basics

By: Lokender Yadav

Crown?

• A dental crown (also referred to as a cap) is a fixed prosthetic object that is cemented onto a tooth

Purpose of Crown

• To cover a damaged tooth,

• To cover Dental Implant

• It also strengthens it,

• improving its overall appearance and alignment in the mouth.

Types of Crown

• All ceramic (porcelain-based).

• Porcelain fused to metal.

• Gold alloys.

• Base metal alloys.

What is PFM?

• Full form : Porcelain-fused-to-metal

• A metal alloy is used to create a thin cap ("substructure") that fits over the tooth.

• Porcelain is then fused over the substructure to form the shape of the crown and give it a white tooth-like appearance.

PFM vs others

• Advantages of PFM's vs. all-metal crowns.(appearance)

• Advantages of PFM's vs. all-ceramic crowns(Strength)

Disadvantage of PFM• They may wear opposing teeth.

• Porcelain breakage

• Challenges in creating a truly lifelike look.(Chalky White)

Others….

What else….

• Veneers

• Onlays

• Inlays

Veneers.. a crown in which the restoration is placed over the prepared surface of a natural crown.

Onlays & Inlays

Clinic to Crown ……

Process..

Clinic

impression

Lab

Crown (Prosthesis)

Digital Vs Analog Dentistry

Speed Accuracy

Analog or Classical Approach

Wax-up Casting Layering Final Crown

Hard model

Digital Workflow(SDM)

Scan

Design

manufacture

Scan

• Scope 1:

Polyvinyl

Siloxane(Physical impression)

Physical Transfer Lab Scanner

Speed & Accuracy factors are under risk……

Scan

• Scope 2:

IOSCloud

Transfer Design

Speed & Accuracy factors are enforced……

Design

Digital Impression I/P

Simulation Validation

Manufacturing

Designed File I/P

Milling Sintering Finishing

Complete CAD-CAM Work Flow

Step1

Prep(C)

Step2

Scan(C)

Step3

Design(L)

Step4

Mill(L)

Step5

Seat(C)